Three-dimensional gear measurement center large-specification part centering clamping device and clamping method

The invention discloses a three-dimensional gear measurement center large-specification part centering clamping device and a clamping method. In the prior art, no large-specification part centering clamping mechanism exists, a common clamping mode cannot meet requirements, and a clamp for clamping common parts is poor in bearing capacity. The device comprises a centering clamping device (15), the centering clamping device comprises a supporting arm (1), the upper portion of the supporting arm is connected with a T-shaped groove strip (3) through a set of screws, a T-shaped nut A (7) and a T-shaped nut B (12) are installed in a groove of the T-shaped groove strip, the T-shaped nut A is connected with a supporting centering assembly (2) through a screw, the supporting centering assembly comprises a sliding block (5), the bottom of the sliding block is connected with a guide pin A (9) through a screw, and the guide pin A (9) is connected with the sliding block through a screw. One side of the upper portion of th